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US09397378B2 Waveguide-type image rejection filter and single-sideband receiver, frequency divider, and sideband-separating receiver using the same filter 有权
波导型图像抑制滤波器和单边带接收机，分频器和使用相同滤波器的边带分离接收机

Waveguide-type image rejection filter and single-sideband receiver, frequency divider, and sideband-separating receiver using the same filter
Abstract:
An image rejection filter comprising a waveguide-type 90-degree hybrid coupler having an input port for receiving an input signal within a millimeter or submillimeter band, first and second output ports for dividing the input signal in two and outputting the divided signals, respectively, wherein the one signal deviates by a 90-degree phase from the other signal, and a branch port for outputting the signal; a pair of band pass filters: a waveguide-type first band pass filter whose one end is connected with the first output port and a waveguide-type second band pass filter whose one end is connected with the second output port; and a pair of radiowave absorptive terminations: a first radiowave absorptive termination connected to the other end of the first band pass filter and a second radiowave absorptive termination connected to the other end of the second band pass filter.
Abstract(Chinese):

一种镜像抑制滤波器，包括波导型90度混合耦合器，具有用于接收毫米或亚毫米波段内的输入信号的输入端口，用于将输入信号分成两部分并输出分频信号的第一和第二输出端口， 其中所述一个信号与其他信号偏离90度相位，以及用于输出所述信号的分支端口; 一对带通滤波器：一端与第一输出端口连接的波导型第一带通滤波器和一端与第二输出端口连接的波导型第二带通滤波器; 以及一对无线电波吸收终端：连接到第一带通滤波器的另一端的第一无线电波吸收终端和连接到第二带通滤波器另一端的第二无线电波吸收终端。

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